COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Bo Yang,Wentuan Bi,Fengxian Jin,Xiaojia Ma,Sheng-Qi Guo
Photodetectors that can directly convert optical signals into electrical signals offer great application prospects in next-generation optoelectronic nanodevices . But to-date, unsatisfactory light absorption and charge carrier separation efficiency still limit their applications. Herein, we developed a facile and low-cost surface molecular engineering strategy to construct high-performance photodetector with CsPbBr3 perovskite nanosheets . Because of the improved optical absorption and charge transfer behavior, CsPbBr 3 /poly(3-hexylthiophene) (P3HT) film photodetector presents a fast response speed, excellent stability and reproducibility. We anticipate that our results not only demonstrate the effectiveness of surface molecular engineering in film photodetector design, but also provide a facile and cost-effective strategy applicable for broadband light optical sensor production.
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JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Kewei Ma,Yuhang Sheng,Guizhen Wang,Xiaowei Zhang,Yunsong Di,Cihui Liu,Liyan Yu,Lifeng Dong,Zhixing Gan
Mn 2+ doping has been developed to modulate the photoluminescence (PL) of CsPbCl 3 perovskite quantum dots (PQDs). However, the doped Mn 2+ may be expelled from the PQDs host with the long-term storing, resulting in inferior stability. Herein, CsPbCl 3 PQDs doped with different concentrations of Mn 2+ (Mn:CsPbCl 3 ) are prepared by a hot injection method. Our photostability tests reveal that when the doping concentration is <25%, or 40%–50%, the Mn 2+ doped PQDs are intrinsically stable. Anion exchange reactions are conducted between the stable CsPb 0.796 Mn 0.204 Cl 3 and CsPbBr 3 PQDs. Fluorescence color gamut of the resulting Mn:CsPb(Cl/Br) 3 PQDs almost covers the entire visible spectrum except for the deep red color. Benefiting from the intrinsic stability and wide color gamut, multicolor solid-state luminescence are acquired by incorporating the Mn:CsPb(Cl/Br) 3 PQDs in polymethyl methacrylate (PMMA) matrices, which are used as color converters for constructing light-emitting diodes (LEDs) with different colors.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Liuting Zhang,Haijie Yu,Zhiyu Lu,Changhao Zhao,Jiaguang Zheng,Tao Wei,Fuying Wu,Beibei Xiao
High hydrogen desorption temperature and sluggish reaction kinetics are the major limitations for the practical application of MgH 2 . In this study, Co particles with a face centered cubic (FCC) structure and a hexagonal close packed (HCP) structure were prepared facilely and proved to be good catalysts for magnesium hydride. Co particles with FCC structure presented better catalytic effect on MgH 2 than that with HCP structure. Both 7% (mass) Co FCC and HCP particle modified MgH 2 decreased the initial dehydrogenation temperature from 301.3 °C to approximately 195.0 °C, but 7% (mass) Co with FCC structure modified MgH 2 has a faster desorption rate, and around 6.5% (mass) H 2 was desorbed in 10 min at 325 °C. Hydrogen uptake was detected at 70 °C under 3.25 MPa hydrogen pressure and 6.0% (mass) H 2 was recharged in 40 min at 150 °C. The hydrogen desorption and absorption activation energy for 7% (mass) FCC Co modified MgH 2 was significantly decreased to (76.6±8.3) kJ·mol −1 and (68.3±6.0) kJ·mol −1 , respectively. Thermodynamic property was also studied, the plateau pressures of MgH 2 + 7% (mass) FCC Co were determined to be 0.14, 0.28, 0.53 and 0.98 MPa for 300 °C, 325 °C, 350 °C and 375°C. The decomposition enthalpy of hydrogen (Δ H ) for MgH 2 + 7% (mass) FCC Co was (80.6±0.1) kJ·mol −1 , 5.8 kJ·mol −1 lower than that of as-prepared MgH 2 . Moreover, cycling performance for the first 20 cycles revealed that the reaction kinetics and capacity of MgH 2 -FCC Co composite remained almost unchanged. The result of density functional theory calculation demonstrated that cobalt could extract the Mg H bond and reduced the decompose energy of magnesium hydride. Our paper can be presented as a reference for searching highly effective catalysts for hydrogen storage and other energy-related research fields.
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Foods
·
2021
·Vol. 10
·期 11
·2810
·
IF 4.35
Xinpeng Yan,Zhong Zhang,Runguang Zhang,Tian Yang,Guoying Hao,Li Yuan,Xingbin Yang
Given the imperative of monitoring organophosphorus pesticides (OPs) residues in the ecosystem, here a novel, facile and sensitive fluorescence sensor is presented for the rapid detection of dimethoate. In this work, surface molecularly imprinted polymer (SMIP) and microfluidic technology had been introduced to enhance the selectivity and portability of the described methodology. Oil-soluble CdSe quantum dots (QDs) synthesized in a green way were used as fluorescent material for the selective detection of dimethoate on the basis of static quenching and photoinduced electron transfer mechanism. Among many kinds of paper materials, glass fiber paper was used as the novel substrate of paper chip due to low pristine fluorescence and better performance when combining CdSe QDs. In the process of molecular imprinting, the interaction between several functional monomers and dimethoate molecule was investigated and simulated theoretically by software to improve the selectivity of the sensor. Consequently, the fabricated novel detection platform could effectively respond to dimethoate in 10 min with the concentration range of 0.45–80 μmol/L and detection limit of 0.13 μmol/L. The recovery in the spiked experiment soybean sample was in an acceptable range (97.6–104.1%) and the accuracy was verified by gas chromatography-mass spectrometry, which signified the feasibility and potential in food sampling.Keywords:oil-soluble CdSe QDs;dimethoate;microfluidic paper chip;fluorescence sensor
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Aizhao Pan,Yajie Zhou,Chunyu Zhao,Chengyu Shi,Youshen Wu,Yanfeng Zhang,Yi Liu,Ling He
All-inorganic lead halide perovskite nanocrystals (NCs) have received considerable attention due to their exceptional optoelectronic characteristics and photovoltaic performance, but their practical applications are restricted by their poor stability. Integrating multifunctionality such as high stability, outstanding flexibility, stretchability and self-healing capability has also been highly desired for flexible full-color displays, soft optical devices, and wearable applications. Here, we developed a facile one-pot photopolymerization strategy to produce highly stable self-healing CsPbBr 3 -based elastomers with outstanding flexibility, scalability, and stretchability. The obtained perovskite NCs (∼10 nm; PLQY of 78%) were capped and passivated with bifunctional methacrylic acid ligands, which provided free double bonds on their surface. The CsPbBr 3 -based elastomers were obtained via the photo-induced copolymerization of functionalized CsPbBr 3 NCs with methyl methacrylate (MMA) and n -butyl acrylate (BA) at room temperature. This yielded homogenous CsPbBr 3 nanocrystals (∼10 nm) dispersed in the copolymer, which displayed a high photoluminescence quantum yield (PLQY > 70%). Versatile and specific luminescent shapes and patterns could be fabricated from the CsPbBr 3 -based elastomers by regulating the constituent content, reaction time, or molding process. The obtained CsPbBr 3 -based elastomers exhibited high air and water stability, high stretchability (∼1300% elongation), tensile recovery (∼100%), and excellent self-healing capability, which also permitted twisting or bending. This facile photopolymerization strategy greatly expands the methods for fabricating highly stable perovskite materials with excellent stretchability and self-healing properties for use in flexible optoelectronic devices.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 48
·17444-17450
·
IF 7.393
Shuhua Tu,Min Chen,Limin Wu
Creating highly efficient and stable pure blue (≈470 nm) perovskite quantum dots (PQDs) remains a considerable challenge. Here, we report an effective synthesis strategy of ultrasmall (≈3.8 nm) blue CsPbBr3 QDs by using PbBr2 clusters as nucleation sites, which then react with Cs-oleate at relatively low temperatures. The emission wavelength of CsPbBr3 QDs ranging from 460 nm to 497 nm could be facilely tuned by the amount of Cs-oleate or reaction temperature. The optimum PL QY of the blue CsPbBr3 QDs reaches as high as above 64%. The CsPbBr3 QDs are further coated with superhydrophobic fluorinated silica and successfully applied in blue light-emitting diodes (LEDs). The nucleation-controlled growth of ultra-small blue PQDs provides a new synthesis strategy for efficient and stable blue PQDs.
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Nanoscale
·
2021
·Vol. 13
·期 47
·20067-20077
·
IF 7.79
Qiugui Zeng,Xin Luo,Yiying Du,Jiexuan Jiang,Lin Yang,Hui Zhao,Heping Shi,Yanbo Li
Metal halide perovskite quantum dots (QDs) hold great promise as building blocks for next-generation light emitting devices (LEDs). The preparation of perovskite QD films with high photoluminescence quantum yield (PLQY) is the key to realizing efficient LEDs. However, the conventional deposition method of spin-coating of pre-synthesized QD ink solutions results in perovskite QD films with low PLQY (typically <45%) due to non-radiative recombination centers induced in the deposition process. Here, by utilizing the ionic nature and steric hindrance effect of the ionic liquid, we demonstrate an in situ deposition method for perovskite QD films with high PLQY by directly spin-coating precursor solutions containing an ionic liquid. Furthermore, mechanistic study reveals that the ionic liquid not only induces the formation of QDs but also suppresses defect-related recombination through the interaction with uncoordinated metal atoms on the surface of the QDs. As a result, the in situ deposited CsPbBr3 QD film with a PLQY as high as 85.2% and long-term air stability is achieved. These findings demonstrate that the introduction of an ionic liquid provides an effective strategy to enhance the performance of in situ formed perovskite QD films, which could benefit the development of efficient LEDs and other optoelectronic devices.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhaoming Wang,Zixian Wei,Yuting Cai,Lei Wang,Mutong Li,Ping Liu,Rongjun Xie,Lai Wang,Guodan Wei,H. Y. Fu
Cesium lead halide perovskite nanocrystals have recently become emerging materials for color conversion in visible light communication (VLC) and solid-state lighting (SSL), due to their fast response and desirable optical properties. Herein, perovskite nanocrystal-polymethyl methacrylate (PNC-PMMA) films with red and yellow emission are prepared. The PNC-PMMA films, with optical properties such as a short lifetime and air stability, are used to make broadband color converters based on a high-bandwidth 75 μm blue micro-LED (μLED) for VLC. The yellow-emitting CsPb(Br/I)3 PNC-PMMA has a high bandwidth of 347 MHz, while the red-emitting CsPbI3 PNC-PMMA exhibits a higher modulation bandwidth of 822 MHz, which is ∼65 times larger than that of conventional phosphors. After fixing the two PNC-PMMA films in front of the μLED, a qualified warm white light is generated with a correlated color temperature of 5670 K, a color rendering index of 75.7, and a de L’Eclairage (CIE) coordinate at (0.33, 0.35). Although the color conversion of the blue light sacrifices some received power and slightly reduces the overall bandwidth from 1.130 to 1.005 GHz, a maximum real-time data rate of 1.7 Gbps is still achievable using the non-return-to-zero on–off keying modulation scheme, which is ∼6 times higher than that of the previous record. This study provides a practical approach to develop a considerably high-bandwidth white-light system for both high-speed VLC and high-quality SSL.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yuhan Ma,Youchao Wei,Feilong Jiang,Yongsheng Liu,Maochun Hong
Photo upconversion that converts low-energy light into high-energy photons holds great promise for boosting the energy conversion efficiencies particularly for photovoltaic devices based on all-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite quantum dots . However, the realization of nonlinear upconversion luminescence (UCL) from these all-inorganic CsPbX 3 perovskites has been met with very limited success until now. Herein, we propose a rational perovskite/upconversion hetero-structured design strategy to achieve excitonic UCL of all-inorganic CsPbX 3 perovskites based on fluorescence resonance energy transfer (FRET), where all-inorganic CsPbX 3 perovskites and upconverting CaF 2 :Ln (Ln = Yb 3+ /Er 3+ , Yb 3+ /Ho 3+ , and Yb 3+ /Tm 3+ ) nanocrystals are closely integrated with each other as a whole by using a modified two-step epitaxial growth approach, forming the unique upconverting CsPbX 3 /CaF 2 :Ln hetero-structured nanocomposites (HSNCs). Benefitting from the extremely high FRET efficiency of ∼99.7%, excitonic UCL from CsPbX 3 perovskites can be realized upon low-power density 980-nm diode laser irradiation. More importantly, all the HSNCs are found to outperform their pure CsPbX 3 counterparts in terms of air-stability, thermal-stability, and excitonic downconversion luminescence intensity, clearly demonstrating the overwhelming advantages of upconverting HSNCs we prepared over the pure CsPbX 3 perovskites for high-performance optoelectronic and photovoltaic applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Shiqing Li,Yating Zhang,Yexin Zu,Yiting Chen,Fang Luo,Da Huang,Zuquan Weng,Bin Qiu,Zhenyu Lin
All-inorganic perovskite quantum dots (CsPbX 3 QDs) with bright photoluminescence are suitable for application in optoelectronic field, but their extreme instability and insolubility in aqueous solution limit their development in other fields. Herein, for the first time, we encapsulated CsPbBr 3 QDs using sulfobutylether-β-cyclodextrins to form nanocomposite (CsPbBr 3 @SBE-β-CD nanocomposite) with high water solubility and stability via a host-guest interaction strategy, in which the PL intensity remained above 100% of the initial value after 3 h storage in water. Hydrogen sulfide (H 2 S) is known to be an important mediator of diverse cellular functions in health and in disease, which is important to develop a selective and portable detection method for H 2 S. The obtained CsPbBr 3 @SBE-β-CD nanocomposite was employed to develop a photothermal sensor for quantitative detection of H 2 S using a thermometer as signal readout. Specifically, the obtained CsPbBr 3 @SBE-β-CD nanocomposite was used as the photothermal probe while H 2 S acted as a switch of the photothermal probe, and the photothermal sensor was triggered by the reaction between H 2 S and CsPbBr 3 @SBE-β-CD nanocomposite. Notably, the naked eye and fluorescence spectrophotometer could also be the signal readout for this strategy, and their detection range and limit of detection were not better than those of the proposed photothermal sensor. On the basis of this H 2 S-triggered photothermal sensor, H 2 S was successfully detected at a concentration as low as 5.0 µM in organs of adult zebrafish at room temperature for 10 min. Such innovative strategy enables new opportunity for the development of affordable assays, especially as point-of-care testing in low-resource settings.
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NANOTECHNOLOGY
·
2021
·Vol. 33
·期 10
·105501
·
IF 3.874
Yunxia Yang,Qian Liu,Yisong Zhao,Jianmin Chen,Bing Chen,Yanling Yan,Faming Gao
The electrode material is vital for the performance of the electrochemical biosensor. Lately, many nanomaterials have been developed to improve the sensitivity and detection efficiency of the biosensors. In this work, a kind of one-dimensional nanomaterials, the CuPt alloy nanotubes with an open end (CuPt alloy NTs-AOE), was explored. The nanotubes with an open end can provide a larger electrochemical active surface area and more active sites for the immobilization of enzyme. The CuPt alloy displays excellent conductivity and catalytic activity. In addition, the Cu shows the great affinity to thio-compounds, which can greatly enhance the detection efficiency and sensitivity. As a result, the prepared biosensor demonstrates the wider linear range of 9.98 × 10−10–9.98 × 10–5 g l−1 for fenitrothion and 9.94 × 10−11–9.94 × 10–4 g l−1 for dichlorvos (as model OPs ) and with the lower detection limit of 1.84 × 10–10 g l−1 and 6.31 × 10–12 g l−1 (S/N = 3), respectively. Besides, the biosensor has been used to detect the real samples and obtains satisfactory recoveries (95.58%–100.56%).
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JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 155
·期 23
·
IF 3.488
Cao Jianfei,Yin Zuodong,Pang Qi,Lu Yuexi,Nong Xiuqing,Zhang Jin Zhong
In this work, we demonstrated an in situ approach for doping CsPbBr 3 nanocrystals (NCs) with In 3+ and Cl − with a ligand-assisted precipitation method at room temperature. The In 3+ and Cl − co-doped NCs are characterized by the powder x-ray diffraction patterns, ultraviolet–visible, photoluminescence (PL) spectroscopy, time-resolved PL (TRPL), ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy. Based on PL and TRPL results, the non-radiative nature of In 3+ -doping induced localized impurity states is revealed. Furthermore, the impact of In 3+ and Cl − doping on charge transfer (CT) from the NCs to molecular acceptors was investigated and the results indicate that the CT at the interface of NCs can be tuned and promoted by In 3+ and Cl − co-doping. This enhanced CT is attributed to the enlarged energy difference between relevant states of the molecular acceptor and the NCs by In 3+ and Cl − upon co-doping. This work provides insight into how to control interfacial CT in perovskite NCs, which is important for optoelectronic applications.
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